ZERO SUCKBACK DEVICES FOR DISPOSABLE HIGH-SPEED TURBINE DENTAL DRILL HANDPIECE

摘要

Zero suckback devices for a disposable high-speed turbine dental drill handpiece, mounted at two ends of a handpiece head body (1). The zero suckback device, provided at one end of the handpiece head body (1) where a bur (3) is mounted, consists of an elastic shaft enclosure (7) and a non-elastic shaft enclosure (6); a hard material center skeleton (8) is embedded at the center of the elastic shaft enclosure (7), and the lip part of the elastic shaft enclosure (7) matches the tapered end part of a rotor shaft (20). The zero suckback device, provided at one side of the handpiece head cover body (2) of the handpiece head body (1), comprises an O-shaped sealing ring (14) provided between a button cover body (15) and the handpiece head cover body (2), and a one-way ball valve provided at the center of the button cover body (2).